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The conventional treatments available are beneficial to only a few patients and, in those, some present adverse side effects that eventually affect the quality of life of most patients. Thus, there is an urgent need for effective, less invasive and targeted specific treatments for PCA. Photothermal therapy (PTT) is a minimally invasive therapy that provides a localized effect for tumour cell ablation by activating photothermal agents (PTA) that mediate the conversion of the light beam\u2019s energy into heat at the site. As tumours are unable to easily dissipate heat, they become more susceptible to temperature increases. In the PTT field, gold nanoparticles (AuNPs) have been attracting interest as PTA. The aim of this study was to formulate AuNPs capable of remaining retained in the tumour and subsequently generating heat at the tumour site. AuNPs were synthesized and characterized in terms of size, polydispersity index (PdI), zeta potential (ZP), morphology and the surface plasmon resonance (SPR). The safety of AuNPs and their efficacy were assessed using in vitro models. A preliminary in vivo safety assessment of AuNPs with a mean size lower than 200 nm was confirmed. The morphology was spherical-like and the SPR band showed good absorbance at the laser wavelength. Without laser, AuNPs proved to be safe both in vitro (&gt;70% viability) and in vivo. In addition, with laser irradiation, they proved to be relatively effective in PCA cells. Overall, the formulation appears to be promising for use in PTT.<\/jats:p>","DOI":"10.3390\/ijms25084488","type":"journal-article","created":{"date-parts":[[2024,4,19]],"date-time":"2024-04-19T08:44:31Z","timestamp":1713516271000},"page":"4488","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["A Step Forward for the Treatment of Localized Prostate Cancer Using Gold Nanoparticles Combined with Laser Irradiation"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-9157-5962","authenticated-orcid":false,"given":"Sara","family":"Pinho","sequence":"first","affiliation":[{"name":"Research Institute for Medicines, iMed.ULisboa\u2014Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9916-3907","authenticated-orcid":false,"given":"T\u00e2nia","family":"Ferreira-Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"Research Institute for Medicines, iMed.ULisboa\u2014Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal"},{"name":"Instituto de Biof\u00edsica e Engenharia Biom\u00e9dica (IBEB), Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0307-3040","authenticated-orcid":false,"given":"Joana","family":"Lopes","sequence":"additional","affiliation":[{"name":"Research Institute for Medicines, iMed.ULisboa\u2014Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4526-2157","authenticated-orcid":false,"given":"Mariana Neves","family":"Amaral","sequence":"additional","affiliation":[{"name":"Research Institute for Medicines, iMed.ULisboa\u2014Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal"},{"name":"Instituto de Biof\u00edsica e Engenharia Biom\u00e9dica (IBEB), Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8405-9672","authenticated-orcid":false,"given":"Ana S.","family":"Viana","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4339-0550","authenticated-orcid":false,"given":"Jo\u00e3o M. P.","family":"Coelho","sequence":"additional","affiliation":[{"name":"Instituto de Biof\u00edsica e Engenharia Biom\u00e9dica (IBEB), Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6814-7226","authenticated-orcid":false,"given":"Maria Manuela","family":"Gaspar","sequence":"additional","affiliation":[{"name":"Research Institute for Medicines, iMed.ULisboa\u2014Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal"},{"name":"Instituto de Biof\u00edsica e Engenharia Biom\u00e9dica (IBEB), Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1046-4031","authenticated-orcid":false,"given":"Catarina Pinto","family":"Reis","sequence":"additional","affiliation":[{"name":"Research Institute for Medicines, iMed.ULisboa\u2014Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal"},{"name":"Instituto de Biof\u00edsica e Engenharia Biom\u00e9dica (IBEB), Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"209","DOI":"10.3322\/caac.21660","article-title":"Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries","volume":"71","author":"Sung","year":"2021","journal-title":"CA Cancer J. Clin."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"778","DOI":"10.1002\/ijc.33588","article-title":"Cancer Statistics for the Year 2020: An Overview","volume":"149","author":"Ferlay","year":"2021","journal-title":"Int. J. 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